LAYOUTGET failure handling

[Vishal Thanki <vishalthanki@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 945 bytes --]

Hi,

I am learning NFS (and pNFS) and not much familiar with its
implementation in Linux kernel. I have a question on the LAYOUTGET
operation.

I have a pNFS server setup which fakes most of the pNFS operations.
The "layout_get" implementation simply returns "-ENOENT". I am not
sure how this should be treated on the pNFS client side. In my
experiment, I am mounting the pNFS server and trying to read a file
(using "cat"). On wireshark trace (attached with the mail), I could
see that LAYOUTGET fails with NFS4ERR_BADLAYOUT error, but afterwards
I see the READ request from client and it is handled gracefully (and I
can see the contents of the file). Is this appropriate behavior?

I am using RHEL6.1 (with pNFS patch for kernel 2.6.32 applied) on
server, and client is RHEL6.1 stock kernel.

I am sorry if this is not the appropriate forum for such kind of
questions, and pardon my ignorance/lack of knowledge in the domain.

Thanks,
Vishal

[-- Attachment #2: pnfs_layoutget_failure.cap --]
[-- Type: application/octet-stream, Size: 27140 bytes --]